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Weird and complicated memory issues in C++
Sometimes when you are developing you encounter the stranged errors. Today is just such a day. I’m right now having issues with memory access violations in on of the programs I’m developing.
This on its own is not that big of a deal, but I can’t seem to trace down why it’s happening. If I debug the function that causes the error has no issues. No memory violations, but when I continue running (without debugging every single call) then all of a sudden at some point in time I get a memory access violation.
Now I don’t exactly know where it’s comming from. It may have something to do with the fact that the object I’m deleting is a prototype of a prototype. And also occasionally gives me an error during compile time that I have no destructor in the class. But when I compile the files one by one it does not give this error. And the class in question does have a default destructor.
Hmm, guess it’s time for some real line by line debugging and digging into the internet about the obscure error message I got.
Autumn vacation break, snapshots
Below are some of the pictures taken during my brief 2 week vacation in the Autumn break 2008.
Upgrading my VPS to Debian Etch
You might have noticed it yesterday, or not ;). But my blog and several other websites hosted by me went offline yesterday for a couple of hours. Well this had to do with me upgrading the VPS to Debian Etch.
So far I ran every website on Debian Sarge, and though it’s stable they choose to no longer developer for it nor support it. So it was time to move to a newer version. Wich I did yesterday. Here’s some of the steps you should take before upgrading to the next version of Debian.
- Make a full backup of any website’s / databases / scripts running (don’t forget your crontab and logrotate files)
- Copy the backup to a directory not affected by the upgrade. In my VPS the provider has one folder which will be left untouched, but also pull the backup to a local system (just in case ;))
- Notify any other users also using your server, don’t want any suprises to potential paying customers.
I was lucky that my hosting provider offers an easy way to upgrade or reinstall a Linux distro on the VPS. Just a couple of mouse clicks and they prepare the VPS for the installation. Please note that this will take up to an hour to complete. Once this base installation is complete you will want to perform the following steps:
- Un rar the backup of the websites / conf files and scripts (tar xf <tar name>) and move them to the right location.
- Setup the proper user account /groups to have access to these files (or your users won’t be able to upload or change the website’s any more)
- Install apache / PHP and mysql by running the following command:
apt-get install php5 mysql5-server apache2 mysqllib - Setup the apache conf file to load in your restored conf files (eg: Include /export/conf/apache/*.conf)
- Replace the mysql my.cnf with the one you backed up previously
- Enable the rewrite and ssl modules of apache (I forgot and got some upset calls :()
From this point on your ready to go. All of the websites should be running without any problems. You do need to configure any other tools you had installed, like AWStats / Subversion or anything else. Though these should not require to much configuration as all of the configuration files where included in your backup. At least if you followed a setup similar to my first article on setting up linux.
Upgrading the HTC P3300, continued
After my first post on upgrading the HTC P3300 (Dopod P800 in the US) some time back it’s time for yet another post on this, see ‘Windows Mobile 6 on HTC P3300′.
This time round I’ve been playing around with two seperate versions of custom ROMs for the HTC P3300. The first one I’ve looked at is the ‘Black&Blue 5.0′ ROM, written by Tom. The second one is the ‘Oops Black 1.0′ also written by Tom. If you need information on how to install these ROMs then look at my earlier article and follow those steps, except you don’t install the Windows Mobile 6.0 ROM but one of the two below.
Black&Blue 5.0
Image of ROM Black&Blue 5.0
The main reason for me to use this ROM was that it was build on top of Windows Mobile 6.1. Why was this so important you may think. Well let me list a couple of nice new features in:
- Better usability with out using the styles
- A lot faster
Though it’s not a big list the first one was reason enough for me. Finally a Windows Mobile version that I don’t need a styles to operate. Some of the parts I really liked about this ROM was that it was really fast. And even better really stable. I’ve had no problems what so ever using this ROM.
You can download the ROM Black&Blue 5.0 here.
Oops Black 1.0
Image of the Oops Black 1.0 ROM
Like I stated before the second ROM I tested was a relatively new one written by Tom. The base of this ROM is identical to the Black&Blue one. It’s also running on Windows Mobile 6.1 and has more or less the same applications installed. One huge difference is that this ROM is attempting to emulate the Touch Diamond style.
For those of you interested in this please let me give you a warning in advance. The ROM looks a lot like the Touch Diamond, but it’s behaviour is nothing like it. So if you are interested in the eye-candy this ROM is for you. If you want the functionality behind it then buy the new phone.
You can download the Oops Black 1.0 here.
Warning notice: Please note that both of these ROMs have been written by a 3rd party, which means you’r phone operator will not support you if your phone breaks. As to support from HTC they might, but you did modify the phone without approval.
Netbeans 6.5 short follow up
(1 votes, average: 5 out of 6)
Loading ...Ok a very short follow up on my previous Netbeans 6.5 impression. Previously I stated that I had some serious problems with the debugging. It failed to indicate which line I was on.
After some research and some more debugging this only appears to happen when debugging jsp files or jspf files. For a beta that is something I can live with. Beyond that the debugger works like a charm.
I did however found some other issues:
- Randomly crashes when right clicking in the project view, seems to have something to do with the parsing of the tree that renders the window.
- You cannot use code completion inside a switch clause. The autocomplete crashes.
- Random crashes when debugging and selecting static variables for modifying their values in code.
To be fair I have to say I never got Netbeans itself to crash. But you do get an exception window that asks you to file a bug report.
